I asked this question a few years ago and the following was sent to me although they did say that "I should note that we cannot offer specific advice on individual dietary matters, which should be discussed with your medical or dietetic advisors"
With that in mind here's their answer "Scotch Whisky is made from cereals (malted barley and wheat or maize for blends, and malted barley alone for malt whiskies), fermented by yeast and distilled before maturation in oak casks. Any sugars from the raw materials are therefore eliminated, though small amounts of natural sugars may arise from the wood of the casks used for maturation, or from caramel used in very small proportions for colour adjustment. Across the range of types of Scotch Whiskies from Blends to Malts, measurable total sugar concentrations can be from about 100 to 500 milligrams/litre (note that sucrose will not normally be found, and most will be fructose and glucose)."
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